<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
  <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item >权限管理</el-breadcrumb-item>
  <el-breadcrumb-item>角色列表</el-breadcrumb-item>
</el-breadcrumb>
<!-- 卡片视图 -->
<el-card>
    <!-- 添加角色按钮区域 -->
    <el-row>
        <el-col>
            <el-button type="primary">添加角色</el-button>
        </el-col>
    </el-row>
    <!-- 角色列表区域 -->
    <el-table :data= 'rolelist' border stripe>
        <!-- 展开列 -->
        <el-table-column type='expand'>
            <!-- eslint-disable-next-line -->
            <template slot-scope="scope">
                 <!-- eslint-disable-next-line -->
                <el-row :class='["bdbottom", i1 ===0 ? "bdtop" : "", "vcenter"]' v-for= "(item1, i1) in scope.row.children" :key = "item1.id">
                    <!-- 渲染一级权限 -->
                   <el-col :span='5'>
                       <el-tag closable @close='removeRightById(scope.row, item1·.id)'>{{item1.authName}}</el-tag>
                       <i class="el-icon-caret-right"></i>
                   </el-col>
                   <!-- 渲染二级和三级权限 -->
                   <el-col :span='19'>
                       <!--通过 for 循环 嵌套渲染二级权限 -->
                          <!-- eslint-disable-next-line -->
                       <el-row v-for="(item2, i2) in item1.children" :key="item2.id" :class="[i2 ===0 ? '' : 'bdtop', 'vcenter']">
                           <el-col :span ='6'>
                               <el-tag type="success" closable @close='removeRightById(scope.row, item2.id)'>{{item2.authName}}</el-tag>
                               <i class="el-icon-caret-right"></i>
                           </el-col>
                           <el-col :span ='18'>
                               <!-- eslint-disable-next-line -->
                               <el-tag v-for='(item3, i3) in item2.children' :key="item3.id" type="warning" closable @close='removeRightById(scope.row, item3.id)'>
                                   {{item3.authName}}
                                   </el-tag>
                           </el-col>
                       </el-row>
                   </el-col>
                </el-row>
            </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type='index'></el-table-column>
        <el-table-column label='角色名称' prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
            <!-- eslint-disable-next-line -->
            <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete">删除</el-button>
                <el-button type="warning" icon="el-icon-setting" @click= "showSetRightDialog(scope.row)">分配权限</el-button>
            </template>
        </el-table-column>
    </el-table>
</el-card>
<!-- 分配权限的对话框 -->
<el-dialog
  title="提示"
  :visible.sync= "setRightDialogVisible"
  width="50%"
  @close = 'setRightDialogClosed'
  >
  <el-tree :data="rightslist" :props="treeProps" ref='treeRef' show-checkbox="" node-key="id" default-expand-all :default-checked-keys= 'defKeys'></el-tree>
  <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click= "allotRights">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>

<script>
export default {
  data() {
    return {
    // 所有角色列表数据
      rolelist: [],
      // 控制权限对话框的显示
      setRightDialogVisible: false,
      rightslist: [],
      // 控制树型组件的对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点 ID值数组
      defKeys: [],
      // 当前即将分配权限的角色 id
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$meddage.console.error('获取角角色列表失败')
      }
      this.rolelist = res.data
      console.log(this.rolelist)
    },
    // 根据Id删除对应的权限
    async removeRightById(role, rightId) {
    // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch((err) => {
        return err
      })
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }
      //   this.getRolesList() 发生页面的完整渲染
      //   为角色信息赋值完整的数据
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取数据失败')
      }
      // 获取到的数据保存到 data  中
      this.rightslist = res.data
      // 递归获取三级节点的ID
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有的三级权限的Id 并保存到 defkey 中
    getLeafKeys(node, arr) {
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        return this.getLeafKeys(item, arr)
      })
    },
    // 监听对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
    margin-top: 7px;
}
.bdtop {
   border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee ;
}
.vcenter {
    display: flex;
    align-items: center;
}
</style>
